English verb conjugation COULD FLATTEN

Regular verb: flatten - flattened - flattened

Affirmation

Simple form

I could flatten
you could flatten
he could flatten
we could flatten
you could flatten
they could flatten

V-ing form

I could be flattening
you could be flattening
he could be flattening
we could be flattening
you could be flattening
they could be flattening

Perfect

I could have flattened
you could have flattened
he could have flattened
we could have flattened
you could have flattened
they could have flattened

V-ing perfect

I could have been flattening
you could have been flattening
he could have been flattening
we could have been flattening
you could have been flattening
they could have been flattening

Negation

Simple form

I couldn't flatten
you couldn't flatten
he couldn't flatten
we couldn't flatten
you couldn't flatten
they couldn't flatten

V-ing form

I couldn't be flattening
you couldn't be flattening
he couldn't be flattening
we couldn't be flattening
you couldn't be flattening
they couldn't be flattening

Perfect

I couldn't have flattened
you couldn't have flattened
he couldn't have flattened
we couldn't have flattened
you couldn't have flattened
they couldn't have flattened

V-ing perfect

I couldn't have been flattening
you couldn't have been flattening
he couldn't have been flattening
we couldn't have been flattening
you couldn't have been flattening
they couldn't have been flattening

Interrogative form

Simple form

could I flatten?
could you flatten?
could he flatten?
could we flatten?
could you flatten?
could they flatten?

V-ing form

could I be flattening?
could you be flattening?
could he be flattening?
could we be flattening?
could you be flattening?
could they be flattening?

Perfect

could I have flattened?
could you have flattened?
could he have flattened?
could we have flattened?
could you have flattened?
could they have flattened?

V-ing perfect

could I have been flattening?
could you have been flattening?
could he have been flattening?
could we have been flattening?
could you have been flattening?
could they have been flattening?

Interro-negative form

Simple form

couldn't I flatten?
couldn't you flatten?
couldn't he flatten?
couldn't we flatten?
couldn't you flatten?
couldn't they flatten?

V-ing form

couldn't I be flattening?
couldn't you be flattening?
couldn't he be flattening?
couldn't we be flattening?
couldn't you be flattening?
couldn't they be flattening?

Perfect

couldn't I have flattened?
couldn't you have flattened?
couldn't he have flattened?
couldn't we have flattened?
couldn't you have flattened?
couldn't they have flattened?

V-ing perfect

couldn't I have been flattening?
couldn't you have been flattening?
couldn't he have been flattening?
couldn't we have been flattening?
couldn't you have been flattening?
couldn't they have been flattening?

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